An ultra-wide-angle micro-light color night vision lens
By using a hybrid glass-tree lens design and thermal optical technology, the problems of numerous optical lenses, heavy lens weight, and small field of view in existing low-light night vision lenses have been solved, achieving lightweight, low-distortion, and ultra-wide-angle imaging, which is suitable for airborne electronic information acquisition equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
- Filing Date
- 2023-11-09
- Publication Date
- 2026-06-12
AI Technical Summary
Existing low-light night vision lenses suffer from problems such as a large number of optical lenses, heavy lens weight, inability to perform large relative aperture imaging, and insufficient field of view.
It adopts a glass-resin hybrid lens design, which combines resin lenses and glass lenses with calorimetric optical design technology to reduce the number of optical lenses, increase the relative aperture, and achieve ultra-wide-angle imaging.
It achieves lightweight lens, low distortion, and ultra-wide-angle imaging, making it suitable for airborne electronic information acquisition equipment and meeting the clear imaging requirements in low-light environments.
Smart Images
Figure CN117331205B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of airborne electronic information acquisition equipment, specifically relating to an ultra-wide-angle low-light color night vision lens. Background Technology
[0002] Low-light night vision lenses are devices that assist in nighttime observation. They utilize natural low-light conditions such as moonlight, starlight, and atmospheric glow to produce color images. Compared to infrared cameras, low-light night vision lenses require higher precision in acquiring information. Furthermore, field-of-view distortion significantly impacts the final image quality during practical use. To improve accuracy, a wide-angle, large-aperture low-light lens is employed, which corrects aberrations by increasing the number of lenses and their interrelationships. Existing low-light night vision lenses face three primary challenges: firstly, large off-axis aberrations and distortion due to the wide field of view; secondly, a rapid decrease in resolution at the field of view edges due to the wide field of view; and thirdly, a rapid decrease in illumination at the field of view edges due to the wide field of view. Solving these problems while maintaining a simple and lightweight design is also crucial.
[0003] Among them, the patent application with application number CN201210538917.8 invented a lightweight and miniature low-light night vision objective lens optical system. By arranging multiple lenses, it effectively achieves good imaging effect of low-light night vision lens through the lightweight and miniaturization of night vision lens. The main adjustment is the angle of the lens and the distance between the lenses.
[0004] Patent application CN201910993352.4 invented a compact low-light night vision lens adapted to a 1-inch target surface. By adjusting the distance between different lenses and selecting different biconcave negative lenses and biconvex positive lenses as needed, it can reduce higher aberrations, eliminate chromatic aberration and secondary spectrum while ensuring a compact structure. In addition to adjusting the distance between different lenses, it also adds an anti-reflective coating to improve the optical performance of the low-light night vision lens, but it still uses optical glass material.
[0005] The aforementioned technologies mainly adjust optical performance by changing the lens structure and the distance between different lenses. However, they still have certain limitations. They do not consider the use of optical resin elements as components of low-light night vision lenses in addition to glass materials. They cannot fully utilize the advantages of optical resin elements, such as good optical performance, light weight, design freedom, and molding characteristics. They cannot achieve the advantages of reducing the number of optical lenses, significantly reducing lens weight, and achieving significant weight reduction by combining different optical resin elements and glass elements. Therefore, there is an urgent need for a new ultra-wide-angle low-light color night vision lens to solve the above-mentioned problems. Summary of the Invention
[0006] In view of this, the present invention proposes an ultra-wide-angle low-light color night vision lens, which can be applied to the field of airborne electronic information acquisition equipment. It can solve the technical problems of existing low-light color night vision lenses, such as a large number of optical lenses, heavy lens weight, inability to perform large relative aperture imaging, and insufficient field of view.
[0007] To achieve the above-mentioned technical objectives, the specific technical solution adopted by the present invention is as follows:
[0008] An ultra-wide-angle low-light color night vision lens includes four sets of light-transmitting components extending in the horizontal direction. The four sets of light-transmitting components are, in order along the light incident direction, a front group, an aperture stop, a rear group, and an image plane. The front group and the rear group are each provided with a corresponding resin lens and a glass lens used in conjunction with the resin lens.
[0009] Furthermore, the front group includes a first resin single lens, a first glass single lens, a second glass single lens, and a third glass single lens arranged sequentially along the light incident direction. The front side of the first resin single lens is aspherical, and the rear side of the first resin single lens is a quadratic surface. The rear group includes a cemented lens group, a fourth glass single lens, and a second resin single lens arranged sequentially along the light incident direction. The front side of the second resin single lens is aspherical, and the rear side of the second resin single lens is non-curved. Both the first resin single lens and the second resin single lens are lenses made of resin material.
[0010] Furthermore, the front surfaces of the second and third glass single lenses are both aspherical, the rear surfaces of the second and third glass single lenses are both non-curved, the front surface of the fourth glass single lens is aspherical, and the rear surface of the fourth glass single lens is concave. The interior of the cemented lens assembly is used in conjunction with two fixedly connected glass lenses.
[0011] Furthermore, the spacing between the first resin single lens and the first glass single lens is 1.42 mm, the spacing between the second glass single lens and the third glass single lens is 3.34 mm, the aperture stop is disposed between the third glass single lens and the cemented lens group, the spacing between the third glass single lens and the aperture stop is 0.1 mm, the spacing between the aperture stop and the cemented lens group is 1.2 mm, the spacing between the cemented lens group and the fourth glass single lens is 0.1 mm, the spacing between the fourth glass single lens and the second resin single lens is 0.1 mm, and the spacing between the second resin single lens and the detector image plane is 8.63 mm.
[0012] Furthermore, a protective light window is provided between the second resin single lens and the image plane, the distance between the second resin single lens and the protective light window is 6.88 mm, and the distance between the image plane and the protective light window is 1.75 mm.
[0013] Furthermore, the distance between the second resin single lens and the image plane is adjustable, with an axial focusing range of ±2mm.
[0014] The design principle of this invention mainly includes: due to the special requirements of ultra-wide-angle lenses: (1) large off-axis aberration and large distortion caused by large field of view; (2) rapid decrease in resolution at the edge of the field of view caused by large field of view; (3) rapid decrease in illumination at the edge of the field of view caused by large field of view; therefore, based on the requirements of simple and lightweight structure, large aperture and high temperature adaptability, this invention utilizes glass-tree hybrid lenses, through the combination and allocation of lens materials and optical power, combined with calorimetric optical design technology, to achieve low distortion and miniaturization of wide-angle night vision camera lenses while meeting the low illumination performance index.
[0015] By adopting the above technical solution, the present invention can also bring the following beneficial effects:
[0016] 1. This invention adopts a lightweight design, and the lens introduces five high-order aspherical balanced optical system aberrations to reduce the number of optical lenses in the optical system. At the same time, the first and last lens materials are made of optical resin, which greatly reduces the weight of the system and achieves lightweight design.
[0017] 2. This invention employs a relative aperture design, enabling the optical system to achieve large relative aperture imaging. This allows the lens to collect more night sky radiation in low-light environments, resulting in clear imaging even in extremely low-light conditions at night.
[0018] 3. This invention has an ultra-wide field of view, up to 129°, a simple and compact structure, and is easy to assemble and debug. At the same time, the distortion of the entire field of view is less than 7%, and the low distortion design can better meet the needs of airborne electronic information acquisition equipment. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the optical system in a specific embodiment of the present invention;
[0021] Figure 2 The MTF evaluation results of the optical system in a specific embodiment of the present invention at room temperature (20°C);
[0022] Figure 3 This refers to the distortion evaluation results of the optical system in a specific embodiment of the present invention;
[0023] The components are: 1. Front group; 2. Aperture stop; 3. Rear group; 4. Image plane; 5. First resin single lens; 6. First glass single lens; 7. Second glass single lens; 8. Third glass single lens; 9. Cemented lens group; 10. Fourth glass single lens; 11. Second resin single lens; 12. Protective light window. Detailed Implementation
[0024] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0026] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.
[0027] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0028] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.
[0029] In one embodiment of the present invention, such as Figure 1As shown, an ultra-wide-angle low-light color night vision lens includes four sets of light-transmitting components extending in the horizontal direction. The four sets of light-transmitting components are, in order along the light incident direction, a front group 1, an aperture stop 2, a rear group 3, and an image plane 4. The front group 1 and the rear group 3 are each provided with a corresponding resin lens and a glass lens used in conjunction with the resin lens.
[0030] The front group 1 includes a first resin single lens 5, a first glass single lens 6, a second glass single lens 7, and a third glass single lens 8 arranged sequentially along the light incident direction. The front side of the first resin single lens 5 is aspherical, and the rear side of the first resin single lens 5 is a quadratic surface. The rear group 3 includes a cemented lens group 9, a fourth glass single lens 10, and a second resin single lens 11 arranged sequentially along the light incident direction. The front side of the second resin single lens 11 is aspherical, and the rear side of the second resin single lens 11 is non-curved. Both the first resin single lens 5 and the second resin single lens 11 are lenses made of resin material.
[0031] The front surfaces of the second glass single lens 7 and the third glass single lens 8 are both aspherical, and the rear surfaces of the second glass single lens 7 and the third glass single lens 8 are both non-curved. The front surface of the fourth glass single lens 10 is aspherical, and the rear surface of the fourth glass single lens 10 is concave. The cemented lens assembly 9 is used internally by two fixedly connected glass lenses. The spacing between the first resin single lens 5 and the first glass single lens 6 is 1.42 mm, the spacing between the second glass single lens 7 and the third glass single lens 8 is 3.34 mm, the aperture stop 2 is located between the third glass single lens 8 and the cemented lens assembly 9, the spacing between the third glass single lens 8 and the aperture stop 2 is 0.1 mm, the spacing between the aperture stop 2 and the cemented lens assembly 9 is 1.2 mm, the spacing between the cemented lens assembly 9 and the fourth glass single lens 10 is 0.1 mm, the spacing between the fourth glass single lens 10 and the second resin single lens 11 is 0.1 mm, and the spacing between the second resin single lens 11 and the detector image plane 4 is 8.63 mm. A protective light window 12 is provided between the second resin single lens 11 and the image plane 4. The distance between the second resin single lens 11 and the protective light window 12 is 6.88 mm, and the distance between the image plane 4 and the protective light window 12 is 1.75 mm.
[0032] The distance between the second resin single lens 11 and the image plane 4 is adjustable, with an axial focusing range of ±2mm, used to compensate for the drift of the image plane 4 in the temperature range of -40℃ to +60℃, ensuring the image quality of the system. The lens focal length of this invention is 6.62mm, and the relative aperture F / # is 1.4, which has an optical calorimetry effect. The total length of the optical system is 74mm, and the weight of the optical system is 61.7g. It makes full use of the excellent performance of optical resin elements, which have good optical performance, light weight, easy shape control, high design freedom, and easy molding characteristics, making them easy to process into aspherical surfaces, resulting in a good weight reduction effect. Furthermore, the calorimetry measures avoid the problem of its large coefficient of thermal expansion, thus achieving the effects of good image quality, large field of view, small distortion, and large relative aperture of this invention.
[0033] like Figure 2 As shown, the optical system of this invention has good image quality, with the MTF (memory flip-flop) of the principal ray above 0.5 throughout at room temperature (20°C). The system exhibits excellent image quality, such as... Figure 3 As shown, the distortion of the entire field of view of the present invention is less than 7%, which has the effect of low distortion.
[0034] In this embodiment, the light beam passes sequentially through the first resin single lens 5, the first glass single lens 6, the second glass single lens 7, the third glass single lens 8, the cemented lens group 9, the fourth glass single lens 10, the second resin single lens 11, and the protective light window 12, and converges onto the image plane 4 to obtain the target image. In summary, this invention achieves low distortion and miniaturization of the wide-angle night vision camera lens while meeting the low-light performance indicators. It has the advantages of reducing the number of optical lenses, reducing lens weight, enabling large relative aperture imaging, and having a large field of view.
[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. An ultra-wide-angle low-light color night vision lens, characterized in that: It includes four sets of light-transmitting components extending in the horizontal direction. The four sets of light-transmitting components are, in order along the light incident direction, the front group (1), the aperture stop (2), the rear group (3) and the image plane (4). The front group (1) and the rear group (3) are each provided with a corresponding resin lens and a glass lens used in conjunction with the resin lens. The front group (1) includes a first resin single lens (5), a first glass single lens (6), a second glass single lens (7) and a third glass single lens (8) arranged sequentially along the light incident direction. The front side of the first resin single lens (5) is aspherical and the rear side of the first resin single lens (5) is a quadric surface. The rear group (3) includes a cemented lens group (9), a fourth glass single lens (10) and a second resin single lens (11) arranged sequentially along the light incident direction. The front side of the second resin single lens (11) is aspherical and the rear side of the second resin single lens (11) is non-curved. Both the first resin single lens (5) and the second resin single lens (11) are lenses made of resin material. The front surfaces of the second glass single lens (7) and the third glass single lens (8) are both aspherical, and the rear surfaces of the second glass single lens (7) and the third glass single lens (8) are both non-curved. The front surface of the fourth glass single lens (10) is aspherical, and the rear surface of the fourth glass single lens (10) is concave. The interior of the cemented lens assembly (9) is used in conjunction with two fixedly connected glass lenses.
2. The ultra-wide-angle low-light color night vision lens as described in claim 1, characterized in that: The distance between the first resin single lens (5) and the first glass single lens (6) is 1.42 mm, the distance between the second glass single lens (7) and the third glass single lens (8) is 3.34 mm, the aperture stop (2) is disposed between the third glass single lens (8) and the cemented lens group (9), the distance between the third glass single lens (8) and the aperture stop (2) is 0.1 mm, the distance between the aperture stop (2) and the cemented lens group (9) is 1.2 mm, the distance between the cemented lens group (9) and the fourth glass single lens (10) is 0.1 mm, the distance between the fourth glass single lens (10) and the second resin single lens (11) is 0.1 mm, and the distance between the second resin single lens (11) and the detector image plane (4) is 8.63 mm.
3. The ultra-wide-angle low-light color night vision lens as described in claim 2, characterized in that: A protective light window (12) is provided between the second resin single lens (11) and the image plane (4). The distance between the second resin single lens (11) and the protective light window (12) is 6.88 mm, and the distance between the image plane (4) and the protective light window (12) is 1.75 mm.
4. The ultra-wide-angle low-light color night vision lens as described in claim 3, characterized in that: The distance between the second resin single lens (11) and the image plane (4) is adjustable, and the axial focusing range is ±2mm.